must engage
Regular verb: engage - engaged- engaged

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must engage
you must engage
he must engage
we must engage
you must engage
they must engage 	I must be engaging
you must be engaging
he must be engaging
we must be engaging
you must be engaging
they must be engaging	I must have engaged
you must have engaged
he must have engaged
we must have engaged
you must have engaged
they must have engaged	I must have been engaging
you must have been engaging
he must have been engaging
we must have been engaging
you must have been engaging
they must have been engaging	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not engage
you must not engage
he must not engage
we must not engage
you must not engage
they must not engage 	I must not be engaging
you must not be engaging
he must not be engaging
we must not be engaging
you must not be engaging
they must not be engaging	I must not have engaged
you must not have engaged
he must not have engaged
we must not have engaged
you must not have engaged
they must not have engaged	I must not have been engaging
you must not have been engaging
he must not have been engaging
we must not have been engaging
you must not have been engaging
they must not have been engaging	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I engage?
must you engage?
must he engage?
must we engage?
must you engage?
must they engage? 	must I be engaging?
must you be engaging?
must he be engaging?
must we be engaging?
must you be engaging?
must they be engaging? 	must I have engaged?
must you have engaged?
must he have engaged?
must we have engaged?
must you have engaged?
must they have engaged? 	must I have been engaging?
must you have been engaging?
must he have been engaging?
must we have been engaging?
must you have been engaging?
must they have been engaging? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not engage?
must you not engage?
must he not engage?
must we not engage?
must you not engage?
must they not engage? 	must I not be engaging?
must you not be engaging?
must he not be engaging?
must we not be engaging?
must you not be engaging?
must they not be engaging? 	must I not have engaged?
must you not have engaged?
must he not have engaged?
must we not have engaged?
must you not have engaged?
must they not have engaged? 	must I not have been engaging?
must you not have been engaging?
must he not have been engaging?
must we not have been engaging?
must you not have been engaging?
must they not have been engaging?